Code-changeable locking structure and key padlock

Abstract

The invention discloses a code-changeable locking structure and a key padlock. The code-changeable locking structure comprises a locking piece, a limiting piece and a plurality of keys. The limiting piece is connected with the locking piece, and the locking piece synchronously moves along with the limiting piece in the same direction so as to switch the unlocking state and the locking state of the locking piece; a strip-shaped through hole is formed in the limiting piece, the keys are arranged in the strip-shaped through hole in a penetrating mode, and when the limiting piece moves along with the locking piece, the limiting piece generates relative displacement with the keys through the strip-shaped through hole; at least two protrusions are arranged on the side face of the key, have position difference in the axial direction and are distributed in a staggered mode in the circumferential direction of the side face of the key. A locking block is arranged on the limiting piece or in the strip-shaped through hole; the key is rotated to switch one of the two bulges on the key to correspond to the position of the locking block; and when the key is switched to be staggered between the bulge and the locking block in an axial movement manner, the key relieves the locking of the limiting piece. According to the scheme, the structure can be simpler, and the material cost and the labor cost can be reduced.

Description

Technical Field

[0001] The present invention relates to a lock, specifically to a code-changeable locking structure and a push-button padlock. Background Art

[0002] Push-button padlocks can be divided into two categories according to the adjustability of the password: fixed-password type and code-changeable type. There has long been a contradiction between the structural safety and functionality of these two types of products. Since the fixed-password type padlock does not need to consider the structure for changing the password, it is relatively easy to simplify the structure by reducing the moving parts. However, once the password is leaked or when multiple people need to share it, there are significant security risks because the password cannot be changed. On the contrary, although the code-changeable type padlock can improve security by resetting the password, it needs to introduce a multi-stage linkage mechanism, resulting in a sharp increase in the number of parts, high assembly complexity, and the redundant structure is prone to problems such as key jamming or reset failure.

[0003] The fixed-password type sacrifices security for a streamlined structure, while the code-changeable type is forced to have a complex design to ensure functional redundancy. Especially in the field of miniaturized padlocks, the traditional structure faces the dual challenges of space constraints and functional completeness. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a code-changeable locking structure and a push-button padlock, which can make the structure simpler and help reduce material costs and labor costs.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A code-changeable locking structure includes a locking member, a restricting member that cooperates with the locking member to lock or unlock, and several push-buttons for locking or unlocking the restricting member; The restricting member is connected to the locking member, and the locking member moves synchronously and in the same direction as the restricting member to switch the unlocking state and locking state of the locking member; A strip-shaped through-hole is provided on the restricting member, and several of the push-buttons are inserted into the strip-shaped through-hole. When the restricting member moves with the locking member, a relative displacement is generated between the restricting member and the push-buttons through the strip-shaped through-hole; At least two protrusions are provided on the side surface of the push-button. The two protrusions have a positional difference in the axial direction, and the two protrusions are circumferentially misaligned along the side surface of the push-button; a locking block is provided at a position corresponding to the protrusion on the restricting member or in the strip-shaped through-hole. The push-button rotates to switch the position of one of the two protrusions on the push-button to correspond to the locking block, so as to restrict the movement of the restricting member through the cooperation of the locking block and the protrusion; and when the push-button switches to a position where the protrusion and the locking block are misaligned by axial movement, the push-button releases the locking of the restricting member.

[0006] As a further improvement of the present invention, a convex edge is provided on the side surface of the push-button, and at least a part of the convex edge covers the edge of the strip-shaped through-hole, which is used to cooperate with the opening of the strip-shaped through-hole to limit the maximum downward movement stroke of the push-button.

[0007] As a further improvement of the present invention, a groove for adapting to the convex edge is further provided on the limiting member. When the locking member moves to the unlocking state, the groove on the limiting member corresponds to the position of the convex edge, and is used for pressing down the key and allowing the convex edge to enter the groove; when the convex edge on the key is located in the groove, the two protrusions on the key are axially misaligned with the lock block.

[0008] As a further improvement of the present invention, one end of the key is used for pressing, and an anti-rotation block is provided at the other end. The anti-rotation block is used to cooperate with the external housing to limit the rotation of the key, and when the key is pressed down until the convex edge enters the groove, the anti-rotation block extends out of the housing and releases the rotation restriction on the key.

[0009] As a further improvement of the present invention, an elastic member is further included. A plurality of limiting grooves are provided on the side surface of the key corresponding to the position of the elastic member. The elastic member and the limiting grooves cooperate to form a key pressing gear, and this gear at least includes two gears where the protrusions respectively correspond to the lock block and the gear where the convex edge is located in the groove.

[0010] As a further improvement of the present invention, the limiting groove is annular and extends along the circumferential direction of the key to form a closed annular groove; and when the key rotates and switches to the position where the protrusion corresponds to the lock block, the position of the limiting groove corresponding to the elastic member expands axially along the key to form an inclined surface.

[0011] A key padlock includes a housing and a replaceable code locking structure as described in any of the above improvement schemes provided in the housing. Openings are provided at both ends of the housing corresponding to the key, and both are used for the key to axially move when pressed, and when one end of the key is pressed down, the other end extends out of the opening.

[0012] A key padlock includes a housing and a replaceable code locking structure as described in the above scheme with an anti-collision block. The housing includes a first housing and a second housing, and the replaceable code locking structure is located between the first housing and the second housing; openings are provided at the positions corresponding to the ends of the key on the first housing and the second housing, and the ends of the key are located in the openings and can axially move, and one of the openings also cooperates with the anti-rotation block to limit the rotation of the key.

[0013] As a further improvement of the present invention, a damping component is further provided between the first housing and the second housing. The damping component includes an elastic member and a fitting member. At least two fitting grooves are provided on the limiting member corresponding to the position of the fitting member. The positions of the two fitting grooves respectively correspond to the positions where the limiting member is in the locked and unlocked states, and when the limiting member is in the locked or unlocked state, the fitting member is embedded in the fitting groove through the elastic member to limit the movement of the limiting member.

[0014] As a further improvement of the present invention, one side of the fitting corresponding to the fitting groove is spherical, and the fitting groove is a bowl-shaped structure adapted to the spherical shape.

[0015] As a further improvement of the present invention, the number of the convex edges is two, and there is a gap between the two convex edges; a baffle is arranged on the first housing at a position corresponding to the gap, and the baffle is used to be embedded into the gap to limit the rotation of the button; when the button is pressed down to make the convex edge enter the groove, the baffle leaves the gap to release the restriction on the rotation of the button.

[0016] As a further improvement of the present invention, a rotation stopper is further arranged at one end of the button corresponding to the second housing, a blocking block is arranged on the second housing at a position corresponding to the rotation stopper, the rotation stopper is used to cooperate with the blocking block to limit the maximum rotation angle of the positive and negative rotation of the button, and when the rotation stopper abuts against the blocking block, one of the two protrusions on the corresponding button corresponds to the position of the lock block.

[0017] The beneficial effect of the present invention is that it can simplify the traditional password-changing structure of the padlock, thereby reducing the material cost and labor cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a front three-dimensional structure schematic diagram of the present invention; Figure 2 is a front three-dimensional structure schematic diagram of the present invention with the first housing removed; Figure 3 is a back three-dimensional structure schematic diagram of the present invention; Figure 4 is an internal structure schematic diagram of the present invention; Figure 5 is a sectional structure schematic diagram of the present invention; Figure 6 is a schematic diagram of the cooperation state between the button and the first housing of the present invention Figure 7 is a schematic diagram of the structure of the limiting member of the present invention; Figure 8 is a schematic diagram of the button structure of the present invention; Figure 9 is a schematic diagram of the button rotated to another perspective of the present invention; Figure 10 is a schematic diagram of the second housing structure of the present invention.

[0019] Reference numerals: 1, locking member; 2, restricting member; 21, strip-shaped through hole; 22, locking block; 23, groove; 24, fitting groove; 3, button; 31, protrusion; 32, convex edge; 321, interval; 33, limiting groove; 331, inclined surface; 34, anti-rotation block; 35, rotation blocking member; 4, elastic member; 5, housing; 51, first housing; 511, baffle; 52, second housing; 521, blocking block; 53, opening; 6, damping assembly; 61, elastic member; 62, fitting member. Detailed implementation manner

[0020] The following will further describe the present invention in detail with reference to the embodiments shown in the drawings.

[0021] Refer to Figure 1-10 as shown A replaceable code locking structure includes a locking member 1, a restricting member 2 that cooperates with the locking member 1 to lock or unlock, and a plurality of buttons 3 for locking or unlocking the restricting member 2; The restricting member 2 is connected to the locking member 1, and the locking member 1 moves synchronously and in the same direction as the restricting member 2 to switch between the unlocked state and the locked state of the locking member 1; A strip-shaped through hole 21 is provided on the restricting member 2, and a plurality of buttons 3 are inserted through the strip-shaped through hole 21. When the restricting member 2 moves with the locking member 1, the restricting member 2 generates a relative displacement with the buttons 3 through the strip-shaped through hole 21; At least two protrusions 31 are provided on the side surface of the button 3. The two protrusions 31 have a position difference in the axial direction, and the two protrusions 31 are circumferentially offset along the side surface of the button 3; a locking block 22 is provided at a position corresponding to the protrusions 31 on the restricting member 2 or in the strip-shaped through hole 21. The button 3 rotates to switch the position of one of the two protrusions 31 on the button 3 to correspond to the locking block 22, so as to restrict the movement of the restricting member 2 through the cooperation of the locking block 22 and the protrusion 31; and when the button 3 switches to a position where the protrusion 31 is offset from the locking block 22 by axial movement, the button 3 releases the locking of the restricting member 2.

[0022] It should be noted that not only one end of the button 3 can be used for pressing. After the button 3 is pressed down, the other end can also be pressed to make the button 3 pop up. Of course, if the size of the button 3 permits, the button 3 can also be pulled out by pulling up after being pressed down.

[0023] In this solution, through the linkage design of the restricting member 2 and the locking member 1, the switching between the locked state and the unlocked state is realized. The restricting member 2 and the locking member 1 move synchronously to ensure the consistency of their actions. The button 3 is inserted through the strip-shaped through hole 21 of the restricting member 2. When the restricting member 2 moves, a relative displacement is generated between the strip-shaped through hole 21 and the button 3, so that the restricting member 2 can be independently adjusted in position without being affected by the button 3, simplifying the structural layout.

[0024] The two protrusions 31 on the side of the button 3 are distributed with axial and circumferential misalignments. By rotating the button 3, one of the protrusions 31 can be selected to cooperate with the lock block 22. When the protrusion 31 corresponds to the lock block 22, the two cooperate, and the protrusion 31 blocks the lock block 22, thereby blocking the movement path of the limiting member 2 to achieve locking; when the button 3 moves axially to misalign the protrusion 31 with the lock block 22, the limiting member 2 can move freely to complete unlocking. This description is for a single button 3. As the number of buttons 3 increases, all buttons 3 need to meet the foregoing conditions for the limiting member 2 to move freely. At this time, a password mechanism is formed. Through the rotation of the button 3, the position state of the protrusion 31 on the button 3 and the lock block 22 can be switched to achieve password change. Moreover, the limiting member 2 is connected to the locking member 1 to produce a synchronous movement effect. Specifically, the locking member 1 can be the lock beam of a padlock or a U-shaped lock beam. The connection position between the locking member 1 and the limiting member 2 can be in a circumferential rotation and axially fixed manner. The password change and locking of this solution only require three components, namely the button 3, the limiting member 2, and the locking member 1, to achieve password change, locking, and unlocking. The number of components is extremely small, greatly simplifying the structure, effectively reducing costs, and at the same time avoiding problems such as jamming caused by complex structures. When in use, those skilled in the art need to note that during normal use, the button 3 should be prevented from being cracked by rotation. Therefore, the button needs to be rotated only when the password can be changed. The specific implementation method will be described later.

[0025] In order to make the operation more stable, in an optional setting method, a convex edge 32 is provided on the side of the button 3, and at least a part of the convex edge 32 covers the edge of the strip-shaped through hole 21, which is used to cooperate with the opening 53 of the strip-shaped through hole 21 to limit the maximum downward movement stroke of the button 3.

[0026] There is a dimensional difference between the convex edge 32 on the side of the button 3 and the width of the strip-shaped through hole 21, which can cover the edge of the strip-shaped through hole 21. When the button 3 is pressed down, the convex edge 32 is blocked by the edge of the opening 53 of the strip-shaped through hole 21, restricting the axial movement range of the button 3. This design avoids the problem of dislocation or damage of the internal structure caused by excessive pressing of the button 3, and at the same time ensures that the button 3 can only move within a preset stroke, improving the reliability and durability of the operation.

[0027] In a further setting, a groove 23 for adapting to the convex edge 32 is also provided on the limiting member 2. When the locking member 1 moves to the unlocking state, the groove 23 on the limiting member 2 corresponds to the convex edge 32, which is used for the button 3 to be pressed down and for the convex edge 32 to enter the groove 23; when the convex edge 32 on the button 3 is located in the groove 23, the two protrusions 31 on the button 3 are axially misaligned with the lock block 22.

[0028] When the locking member 1 is in the unlocked state, the groove 23 of the limiting member 2 is aligned with the convex edge 32 of the key 3, allowing the key 3 to be further pressed down so that the convex edge 32 is embedded in the groove 23. At this time, the two protrusions 31 of the key 3 are misaligned with the lock block 22, which can be used to change the password, because the two protrusions 31 at this time are axially misaligned with the lock block 22, and the key 3 can be rotated. The problem that the password cannot be changed will not occur due to the existence of the protrusions 31 causing the key 3 to be unable to rotate due to the limiting effect between the protrusions 31 and the lock block 22 when the key 3 is rotated. At the same time, the abutment effect of the groove 23 and the convex edge 32 can also provide a prompt effect of being in place. When the key 3 is not unlocked, the groove 23 is not aligned with the convex edge 32, and the convex edge 32 cannot be pressed down into the groove 23. There will be an obstruction between the protrusion 31 and the lock block 22, so that the key 3 cannot be rotated at will, and then an obstruction effect of password change is generated, so that the user can only change the password in the unlocked state. This structure improves security on the basis of maintaining the original number of components.

[0029] In an optional preferred solution, one end of the button 3 is used for pressing, and the other end is provided with an anti-rotation block 34, which is used to cooperate with the outer shell 5 to limit the rotation of the button 3, and when the button 3 is pressed down until the convex edge 32 enters the groove 23, the anti-rotation block 34 extends out of the shell 5 and releases the rotation restriction on the button 3. As shown in the figure, it is a square with rounded corners. Of course, it can also be a regular hexagon, etc.

[0030] The anti-rotation block 34 cooperates with the opening 53 of the housing 5 to limit the rotational freedom of the button 3 under normal conditions to prevent the password from being accidentally modified. When the button 3 is pressed down until the convex edge 32 enters the groove 23, the anti-rotation block 34 is free from the restriction of the housing 5, allowing the user to rotate the button 3 to switch the position of the protrusion 31 and complete the password reset. This design ensures stability in daily use while only opening the rotation function in specific operation steps, taking into account both safety and functionality.

[0031] In another optional setting, as a supplementary functional design, the present solution also includes an elastic member 4, and a plurality of limit grooves 33 are provided on the side of the button 3 corresponding to the position of the elastic member 4. The elastic member 4 cooperates with the limit grooves 33 to form a downward pressing position of the button 3, and the gear position includes at least two protrusions 31 respectively corresponding to the locking block 22 and a gear position where the protruding edge 32 is located in the groove 23.

[0032] The elastic member 4 (such as a reed) cooperates with the limit groove 33 to form a clear tactile feedback, enabling the user to perceive different gears when operating the button 3 (such as the first locking gear, the second locking gear, and the password reset gear. It should be noted that the first locking gear is the state where one protrusion 31 corresponds to the lock block 22, the second locking gear is the state where the other protrusion 31 corresponds to the lock block 22, and the password reset gear is the state where the convex edge 32 enters the groove 23). The distribution of the limit groove 33 matches the axial movement path of the button 3, ensuring stable positioning when the protrusion 31 is aligned or misaligned with the lock block 22, avoiding gear shift caused by vibration or accidental touch, and improving the accuracy of the pressing position of the button 3.

[0033] In a preferred setting, the limit groove 33 is annular and extends along the circumferential direction of the button 3 to form a closed annular groove; and when the button 3 rotates to switch to the position where the protrusion 31 corresponds to the lock block 22, the position of the limit groove corresponding to the elastic member 4 extends axially along the button 3 to form an inclined surface 331.

[0034] The annular limit groove 33 allows the button 3 to maintain a stable cooperation with the elastic member 4 during rotation, preventing the elastic member 4 from coming out. When the button 3 rotates to the position where the protrusion 31 is aligned with the lock block 22, the axially extended part of the limit groove 33 provides a longer deformation space for the elastic member 4, reducing the axial resistance. At the same time, when entering another limit groove 33, it can produce a transitional effect of the inclined surface. The elastic member 4 first contacts the axially extended inclined surface. Under the action of the elastic force, the elastic member 4 can abut along the extended part, and at the same time, with the cooperation of the transitional and guiding effects, the button 3 generates a certain axial movement under the action of the elastic force, which helps the elastic member 4 quickly match to the deepest part of the limit groove 33 of the button 3.

[0035] The above description of the solution is mainly about the replaceable code locking structure, and it will be further described below when it is applied to a padlock: A button padlock includes a housing 5 and a replaceable code locking structure as described in any of the above improvement solutions provided in the housing 5. Openings 53 are provided at both ends of the housing 5 corresponding to the button 3, and both are used to press the button 3 for axial movement. When one end of the button 3 is pressed down, the other end extends out of the opening 53.

[0036] The design of the double-sided opening 53 of the housing 5 allows the user to press the button 3 from both ends. When one end of the button 3 is pressed down, the other end will extend out. At this time, it is convenient for the user to press the button 3 from the other end of the button 3 to reset it.

[0037] A push-button padlock includes a housing 5 and a code-changing locking structure with an anti-rotation block 34 as described above. The housing 5 includes a first housing body 51 and a second housing body 52, and the code-changing locking structure is located between the first housing body 51 and the second housing body 52. Openings 53 are provided at the positions corresponding to the ends of the push button 3 on both the first housing body 51 and the second housing body 52, and the ends of the push button 3 are located in the openings 53 and can move axially. One of the openings 53 also cooperates with the anti-rotation block 34 to cooperate with the anti-rotation block 34 to limit the rotation of the push button 3.

[0038] The split housing 5 (the first housing body 51 and the second housing body 52) is convenient for assembly. The first housing body 51 and the second housing body 52 can be riveted by rivets. At the same time, through the cooperation of the opening 53 and the anti-rotation block 34, the rotational freedom of the push button 3 is further restricted. Only when the convex edge 32 of the push button 3 enters the groove 23, the anti-rotation block 34 will completely extend out of the opening 53, and the push button 3 can rotate. Moreover, only when the anti-rotation block 34 rotates to a shape that aligns with the opening 53 again can it be pressed and retracted into the opening 53 to play an anti-rotation role. This effect can also be reflected in positioning the position of the protrusion 31 on the push button 3. By using the cooperation of the shape of the anti-rotation block 34 and the opening 53, the corresponding state between the position of the protrusion 31 and the position of the lock block 22 can be made more stable.

[0039] In a further setting, a damping assembly 6 is also provided between the first housing body 51 and the second housing body 52. The damping assembly 6 includes an elastic member 61 and a fitting member 62. At least two fitting grooves 24 are provided at the position corresponding to the fitting member 62 on the restricting member 2. The positions of the two fitting grooves 24 respectively correspond to the positions of the limiting member in the locked and unlocked states. And when the restricting member 2 is in the locked or unlocked state, the fitting member 62 is embedded in the fitting groove 24 through the elastic member 61 to restrict the movement of the restricting member 2.

[0040] The fitting member 62 of the damping assembly 6 is embedded in the fitting groove 24 under the action of the elastic member 61 to form a mechanical self-locking in the locked or unlocked state. This design prevents the restricting member 2 from accidentally moving in the non-operating state through physical limiting, improves the stability of the padlock in the locked or unlocked state to a certain extent, and at the same time provides a clear feeling of gear shifting and improves the user experience.

[0041] Preferably, one side of the fitting member 62 corresponding to the fitting groove 24 is spherical, and the fitting groove 24 is a bowl-shaped structure adapted to the spherical shape.

[0042] The cooperation between the spherical fitting member 62 and the bowl-shaped fitting groove 24 reduces the friction force of the contact surface, makes the fitting member 62 easier to slide into or out of the fitting groove 24, ensures the smooth operation of the damping assembly 6, and at the same time extends the service life of the fitting member 62.

[0043] In addition, as an optimal solution to enhance the stability and safety of the activity of the key 3, the number of the convex edges 32 is two, and there is a gap 321 between the two convex edges 32; a baffle 511 is arranged at a position on the first housing 51 corresponding to the gap 321, and the baffle 511 is used to be embedded in the gap 321 and limit the rotation of the key 3; when the key 3 is pressed down to make the convex edge 32 enter the groove 23, the baffle 511 leaves the gap 321 to release the restriction on the rotation of the key 3.

[0044] The cooperation between the double convex edges 32 and the baffle 511 realizes the double locking of the rotation function of the key 3. Under normal conditions, the baffle 511 is embedded in the gap 321 to completely limit the rotation of the key 3; only when the key 3 is pressed down until the convex edge 32 enters the groove 23, the baffle 511 disengages from the gap 321 to open the rotation function. This design further improves the security of the password replacement operation, prevents unauthorized users from cracking the password by violent rotation, and the baffle 511 also has a guiding effect, which can make the activity of the key 3 more stable. This solution cooperates with the anti-rotation block 34 to achieve double locking and further increase the security. Of course, it can be predicted that due to the existence of the gap 321 between the two convex edges 32, after the key 3 rotates, it is still necessary to make the baffle 511 correspond to the position of the gap 321. Therefore, the position of the gap 321 needs to be ensured so that the baffle 511 can enter the gap 321 for cooperation after the key 3 rotates to change the corresponding relationship between the convex block and the lock block 22. In fact, as an optional solution, the positions of the two convex blocks are respectively located on both sides of the key 3, forming a 180° relationship in the circumferential direction with the key 3 as the axis. Similarly, the gap 321 and the baffle 511 can also be located on both sides of the key 3, and also form a 180° relationship in the circumferential direction with the key 3 as the axis.

[0045] In a further setting, a rotation stopper 35 is further arranged at one end of the key 3 corresponding to the second housing 52, and a blocking block 521 is arranged at a position on the second housing 52 corresponding to the rotation stopper 35. The rotation stopper 35 is used to cooperate with the blocking block 521 to limit the maximum rotation angle of the forward and reverse rotation of the key 3, and when the rotation stopper 35 abuts against the blocking block 521, one of the two protrusions 31 on the corresponding key 3 corresponds to the position of the lock block 22.

[0046] The rotation stopper 35 and the blocking block 521 define the maximum rotation angle of the key 3, ensuring that the user can only switch the position of the protrusion 31 within a preset range. In the case of only two convex blocks, the cooperation between the rotation stopper 35 and the blocking block 521 can produce two in-place states, that is, the states corresponding to the two convex blocks and the lock block 22, which can make it more convenient for the user to switch the password. When the rotation stopper 35 abuts against the blocking block 521, the corresponding protrusion 31 and the lock block 22 are precisely corresponding, avoiding password setting errors caused by excessive rotation and improving the reliability of password reset.

[0047] The above are only the preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. A code-changeable locking structure, characterized in that: It includes a locking piece, a limiting piece that cooperates with the locking piece to lock or unlock, and a plurality of buttons for locking or unlocking the limiting piece; The limiting member is connected to the locking member, and the locking member moves synchronously and in the same direction as the limiting member to switch the locking member between an unlocked state and a locked state; The limiting member is provided with a strip-shaped through hole, and a plurality of the keys are inserted into the strip-shaped through hole. When the limiting member moves with the locking member, the limiting member generates relative displacement with the keys through the strip-shaped through hole. At least two protrusions are arranged on the side of the button, and the two protrusions have a position difference in the axial direction, and the two protrusions are staggered circumferentially along the side of the button; a locking block is arranged at a position corresponding to the protrusion on the limiting member or in the strip through hole, and the button is switched by rotation so that one of the two protrusions on the key corresponds to the position of the locking block, so that the movement of the limiting member is limited by the cooperation between the locking block and the protrusion; and when the button is switched to the position where the protrusion and the locking block are misaligned by axial movement, the button releases the lock of the limiting member.

2. The code-changeable locking structure according to claim 1, characterized in that: A convex edge is arranged on the side of the key, and at least a part of the convex edge covers the edge of the strip-shaped through hole, so as to cooperate with the opening of the strip-shaped through hole to limit the maximum downward movement travel of the key.

3. The code-changeable locking structure according to claim 2, characterized in that: The limiting member is also provided with a groove for adapting to the convex edge. When the locking member moves to the unlocked state, the groove on the limiting member corresponds to the position of the convex edge, so that the key can be pressed down and the convex edge can enter the groove. When the convex edge on the key is located in the groove, the two protrusions on the key are axially misaligned with the locking block.

4. The code-changeable locking structure according to claim 3, characterized in that: One end of the button is used for pressing, and the other end is provided with an anti-rotation block, which is used to cooperate with the external shell to limit the rotation of the button, and when the button is pressed down until the convex edge enters the groove, the anti-rotation block extends out of the shell and releases the rotation restriction on the button.

5. The code-changeable locking structure according to claim 1, 2, 3 or 4, characterized in that: It also includes an elastic member, and a plurality of limit grooves are arranged on the side of the button corresponding to the position of the elastic member. The elastic member and the limit groove cooperate to form a key pressing position, and the position includes at least two positions where protrusions correspond to the locking blocks respectively and a position where the protrusion is located in the groove.

6. The code-changeable locking structure according to claim 5, characterized in that: The limiting groove is annular and extends along the circumference of the key to form a closed annular groove; and when the key is rotated and switched to the position where the protrusion corresponds to the locking block, the position of the limiting groove corresponding to the elastic member extends along the axial direction of the key to form an inclined surface.

7. A key padlock, characterized in that: It comprises a shell and a code-changeable locking structure as described in any one of claims 1 to 6 arranged in the shell, wherein both ends of the shell corresponding to the button are provided with openings, and both are used to press the button for axial movement, and when one end of the button is pressed down, the other end extends from the opening.

8. A key padlock, characterized in that: It comprises a shell and a code-changeable locking structure as claimed in claim 4, wherein the shell comprises a first shell and a second shell, and the code-changeable locking structure is located between the first shell and the second shell; openings are provided at positions corresponding to the ends of the keys on the first shell and the second shell, and the ends of the keys are located in the openings and can move axially, and one of the openings also cooperates with an anti-rotation block to cooperate with the anti-rotation block to limit the rotation of the key.

9. The key padlock according to claim 8, characterized in that: A damping assembly is also arranged between the first shell and the second shell, and the damping assembly includes an elastic member and an engaging member. At least two engaging grooves are arranged on the limiting member at positions corresponding to the engaging members. The positions of the two engaging grooves respectively correspond to the positions of the limiting member in a locked state and an unlocked state, and when the limiting member is in a locked state or an unlocked state, the engaging member is embedded in the engaging groove through the elastic member to limit the movement of the limiting member.

10. The key padlock according to claim 9, characterized in that: One side of the engaging piece corresponding to the engaging groove is spherical, and the engaging groove is a bowl-shaped structure adapted to the spherical shape.

11. The key padlock according to claim 8, 9 or 10, characterized in that: There are two protrusions, and there is a gap between the two protrusions; a baffle is provided at a position corresponding to the gap on the first shell, and the baffle is used to embed into the gap and limit the rotation of the key; when the key is pressed down and the protrusion enters the groove, the baffle leaves the gap to release the restriction on the rotation of the key.

12. The key padlock according to claim 11, characterized in that: A rotating stopper is also provided on the button at one end corresponding to the second shell, and a blocking block is provided at the position corresponding to the rotating stopper on the second shell. The rotating stopper is used to cooperate with the blocking block to limit the maximum rotation angle of the button in forward and reverse directions, and when the rotating stopper abuts against the blocking block, one of the two protrusions on the corresponding button corresponds to the position of the locking block.

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